TANSO-CAI-2 onboard GOSAT-2 satellite is a multi-spectral imager for the observation of cloud and aerosol. The CAI- 2 has 10 observation bands with 7 different wavelengths, which cover 340-1630 nm. The wavelength width of each band is less than 13 nm in the UV to NIR band and less than 73 nm in the SWIR band. From Feb. 2019, the evaluation of the initial calibration phase was carried out to calibrate the geometric and radiometric characteristics. Following the initial calibration phase, the evaluation of radiometric performance has been continuously conducted. The evaluation of dark level and dark noise has shown almost stable results, although there is some variation. The radiometric response evaluation using the lunar calibration data and the ROLO model showed a degradation in the UV Bands, especially in Band 1 (340 nm), which showed a degradation of about 8% in the two years relative to Band 4 (865 nm). No obvious response degradation was observed for the other bands. Those results suggest that the radiometric performance of the CAI-2 is almost maintained for two years since the initial calibration phase.
The GOSAT thermal infrared (TIR) band calibration is reviewed for the five-year time period from April 2009 through
March 2014. Pre-launch characterization has been augmented by post-launch analysis of on-orbit data and comparison
with coincident measurements from other satellite, airborne, and ground-based sensors. Successive refinements of the
TIR band ground-processing software have incorporated corrections for detector non-linearity and polarization.
Estimates of radiometric uncertainty have also been made. The comparison of GOSAT TIR band nadir and off-nadir
comparisons (SNOs and SONOs) provide a quantitative spectral assessment of the radiometric bias relative to the NASA
AIRS and EUMETSAT IASI sensors.
Measurement of trace gases from satellite is useful technique to grasp the atmospheric information on a regional scale. In
recent years, exhaust gas emitted by developing country has become a huge social issue. It greatly affects global
environmental problems. In this study, we focused on Nitrous Oxide (N2O) in East Asia. N2O has a strong radiative
forcing and has gotten a lot of attention as the greenhouse effect and ozone-depleting gases recently. We conducted the
sensitivity analysis of N2O using the infrared spectral radiances measured by Tropospheric Emission Spectrometer (TES),
which was launched on NASA's EOS Aura satellite in July 2004. Based on these result, we selected retrieval channel
and tried to retrieve the troposheric profile of N2O. In this paper, we will present the preliminary result.
Greenhouse gases Observing SATellite (GOSAT) is a Japanese mission to observe greenhouse gases, such as CO2 and
CH4, from space with a Fourier transform spectrometer and a push broom imager. The GOSAT was launched on January
23, 2009. The initial functional check-out phase was completed on April 10 to confirm the on-orbit performance. The
initial calibration and validation phase was completed on July 30 in the following 3 months to acquire observation data at
calibration and validation sites. The initial calibration was evaluated on accuracies of radiometry, geometry and
spectrometry by using acquired data. The results were reflected to the improvement of the Level 1 algorithm and the
products. The initial calibrated Level 1 products have been already released to the GOSAT research PIs in August.
Greenhouse gases Observing SATellite (GOSAT) is a Japanese mission to observe greenhouse gases, such as CO2 and
CH4, from space. The GOSAT carries a Fourier transform spectrometer and a push broom imager. The development of
GOSAT satellite and sensors has almost finished after the characterization of sensor performance in laboratory. In orbit,
the observation data will be evaluated by onboard calibration data and implemented by ground processing system. Level
1 algorithm and processing system are developed by JAXA. The post-launch calibration items are planned and the
methods are developed before launching. We show the Level 1 processing and in-orbit calibration of GOSAT sensors.
KEYWORDS: Calibration, Sensors, Fourier transforms, Reflectivity, Short wave infrared radiation, Black bodies, MODIS, Signal to noise ratio, Lamps, Gases
Greenhouse gases Observing SATellite (GOSAT) is a Japanese mission to observe greenhouse gases, such as CO2 and
CH4, from space. The GOSAT carries a Fourier transform spectrometer and a push broom imager. The GOSAT
development is going on in phase-C/D and characterized the sensor performance in laboratory. In orbit, the observation
data will be evaluated by onboard calibration data and implemented by ground processing system. The post-launch
calibration items are planned and the methods will be developed before the launch. The methods are investigated by
analyzing the current MODIS data, which has similar wavelength bands to GOSAT. In this paper, we show the
calibration plans of pre-flight test, onboard calibration, and post-launch vicarious calibration of GOSAT sensors.
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